To maintain its proper function, a sewer system needs a cleaning schedule. There are several traditional cleaning techniques used to clear blockages and to act as preventative maintenance tools. When cleaning sewer lines, local communities need to be aware of EPA regulations on solid and hazardous waste as defined in 40 CFR 261. In order to comply with state guidelines on testing and disposal of hazardous waste, check with the local authorities.
* Uses an engine and a drive unit with continuous rods or sectional rods
* As blades rotate they break up grease deposits, cut roots, and loosen debris
* Rodders also help thread the cables used for TV inspections and bucket machines
* Most effective in lines up to 300 mm (12 inches) in diameter
* Cylindrical device, closed on one end with 2 opposing hinged jaws at the other
* Jaws open and scrape off the material and deposit it in the bucket
* Partially removes large deposits of silt, sand, gravel, and some types of solid waste
* A threaded rubber cleaning ball that spins and scrubs the pipe interior as flow increases in the sewer line
* Removes deposits of settled inorganic material and grease build-up
* Most effective in sewers ranging in size from 13-60 cm (5-24 inches)
* Introduces a heavy flow of water into the line at a manhole
* Removes floatables and some sand and grit
* Most effective when used in combination with other mechanical operations, such as rodding or bucket machine cleaning
* Directs high velocities of water against pipe walls
* Removes debris and grease build-up, clears blockages, and cuts roots within small diameter pipes
* Efficient for routine cleaning of small diameter, low flow sewers
* Round, rubber-rimmed, hinged metal shield that is mounted on a steel framework on small wheels. The shield works as a plug to build a head of water
* Scours the inner walls of the pipe lines
* Effective in removing heavy debris and cleaning grease from line
Kites, Bags, and Poly Pigs:
* Similar in function to the ball
* Rigid rims on bag and kite induce a scouring action
* Effective in moving accumulations of decayed debris and grease downstream
* Collect sediments at convenient locations
* Must be emptied on a regular basis as part of the maintenance program
Grease Traps and Sand/Oil Interceptors:
* The ultimate solution to grease build-up is to trap and remove it
* These devices are required by some uniform building codes and/or sewer-use ordinances. Typically sand/oil interceptors are required for automotive business discharge Need to be thoroughly cleaned to function properly.
* Cleaning frequency varies from twice a month to once every 6 months, depending on the amount of grease in the discharge
* Need to educate restaurant and automobile businesses about the need to maintain these traps
* Used to control roots, grease, odors (H2S gas), concrete corrosion, rodents and insects
* Root Control – longer lasting effects than power rodder (approximately 2-5 years)
* H2S gas – some common chemicals used are chlorine (Cl2), hydrogen peroxide (H2O2), pure oxygen (O2), air, lime (Ca(OH2)), sodium hydroxide (NaOH), and iron salts
* Grease and soap problems – some common chemicals used are bio-acids, digester, enzymes, bacteria cultures, catalysts, caustics, hydroxides, and neutralizers
NOTE: Before using these chemicals review the Safety Data Sheets (SDS) and consult the local authorities on the proper use of chemicals as per local ordinance and the proper disposal of the chemicals used in the operation. If assistance or guidance is needed regarding the application of certain chemicals, contact the U.S. EPA or state water pollution control agency.
A jet rodder cleans 255,000 ft. of sewer line per month. If the operating costs of the rodder is $0.42 per 100 ft. What is the monthly cost to use the rodder?
First calculate the number of 100 foot sections. Then calculate the monthly cost.
Number of 100 foot sections = (255,000 ft) / (100 ft) = 2,550 sections
Cost per month = 2,550 x $0.42 = $1,071.00